Difference between CAN1 and CAN 2 ports, In Mini carrier board only CAN 2 port is available, can we use dual GPS CAN setup?

Can we use CAN splitter to Connect dual CAN here 3 GPS in CAN 2 port of the mini carrier board?

Note: Current firmware only support CAN 1 ,CAN 2 is not supported. Dual CAN will be enabled in a future firmware update.
As per the screenshot CAN 2 is not supported what that means?